xenapi: Get rid of internal xapi interface

OpenStack VM had 4 interfaces, from which eth0 was not used at all. This
change removes the non-used interface, thus devstack is providing the
same architecture as described in the official documentation:

    http://goo.gl/dmrNF

Related to blueprint xenapi-devstack-cleanup

Change-Id: I73c9751ade6f4786b8b682a1994cb87f0a624379
Change path to loadbalancer plugin

LoadbalancerPlugin path needs to be changed to reflect renaming
agent_loadbalancer to loadbalancer and moving services directory
one level up.

Change-Id: Ib2ece411b5fb84575673a66421eb474888dd8f43
Fix the OVS version check to work with upstream master versions of OVS.

This patch adds two functions to check version strings in the toplevel
functions file. The openvswitch_agent then uses these to compare versions
when checking for tunneling support. The tunneling version check now
also takes into account upstream master versions of Open vSwitch, which
the previous version check always failed on.

Fixes bug #1190734

Change-Id: I0102fb57f8ce5529169025efa21a0996ad68bef1
F19 rpm dependencies

Fedora 19 rpm dependencies are the same as Fedora 18.
* Adding f19 to the 'dept:' list.

Change-Id: I927c31d45ac03b8bddac117e7f501d1255a25200
exercise euca.sh check the volume just created

In devstack, the exercises/euca.sh test the "VOLUME". it should always
check the volume which was just created. Because there may be volumes
left by the last failed euca.sh, then the variable VOLUME
VOLUME=`euca-describe-volumes | cut -f2`
will be assigned a list of volumes, which is not expected.

Fixes bug #1191424

Change-Id: Ie004c9cfeaef4a8a313866d21d45c7b41f1b2ba0
xenapi: cleanup VM Installation

VM installation created a machine with multiple network interfaces. This
is a needless complexity at that point. This change remove the network
setup from install-os-vpx.sh script, and cleans it up.

Change-Id: Ib0a0a316e849f2c2651305ea657c84820cd2bb3b